ECN Forum Forums General Topics of the Trade General Discussion Area Stranded wire on devices?

I see a couple of things here that concern me.

1. Twisting the strands: It seems that twisting the strands other than their manufactured lay could be a problem, not so much with the NEC but in industrial manufacturing. I've been told it violates IPC (electronic/electrical quality) and UL but I can't find it.

2. Sta-cons and other crimp lugs: These cannot be used on devices that are not specifically listed for lugs, forked, ring, or single. The white book says that switches can use lugs but that outlets cannot (unless so identified by the manufacturer). Problems that can occur are uneven loading and bending of the screw head (single lugs), spreading of the fork under pressure, and terminal screw must be removed to install a ring.

Comments?